Numerical study of mixed convection on jet impingement cooling in a horizontal porous layer-using Brinkman-extended Darcy model

Wong, Kok Cheong; Saeid, Nawaf H.

doi:10.1016/j.ijthermalsci.2008.03.006

Cited by 31 publications

(19 citation statements)

References 23 publications

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“…4c shows thoroughly mixed convection with double vortices which lead to minimum value of N u f = 2.138. This behaviour of minimum average Nusselt number for the case with cavity is similar to the results reported by study without cavity [6,19] in which opposing effect between vertical jet and upward buoyancy renders poorer heat transfer rate. This effect is significant when the buoyant flow and jet flow are thoroughly mixed.…”

Section: Resultssupporting

confidence: 87%

“…Generally, convection and heat transfer in porous media has been extensively investigated [1][2]. The characteristics of jet impingement cooling through porous medium are becoming important as it has attracted much attention from researchers [3][4][5][6]. It has been known that, high heat flux could induce buoyancy flow that opposing the jet flow to cause opposing mixed convection.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study of mixed convection on jet impingement cooling in an open cavity filled with porous medium

Wong¹,

Saeid²

2009

International Communications in Heat and Mass Transfer

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Numerical study of mixed convection on jet impingement cooling in an open cavity filled with porous medium

Wong¹,

Saeid²

2009

International Communications in Heat and Mass Transfer

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“…[46]. Equations (12), (18) and (22), together with the boundary conditions (15)(16)(17), (19)(20), (23) and (24), are solved numerically using an implicit, iterative tri-diagonal finite difference method similar to that discussed in Refs. [47,48].…”

Section: Self-similar Solutionsmentioning

confidence: 99%

“…Nevertheless, the flow pressure drop is also intensified [19]. Subsequently, Wong and Saeid [20,21] conducted a heat transfer optimisation on the problem of jet flow blowing on the surface of a horizontal porous insert heated from below.…”

Section: Introductionmentioning

confidence: 99%

Mixed convection and thermodynamic irreversibilities in MHD nanofluid stagnation-point flows over a cylinder embedded in porous media

Alizadeh

Karimi

Arjmandzadeh

et al. 2018

J Therm Anal Calorim

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The impingement of CuO-water nanofluid flows upon a cylinder subject to a uniform magnetic field with constant surface temperature and embedded in porous media is investigated for the first time in literature. The surface of the cylinder can feature uniform or non-uniform mass transpiration and is hotter than the incoming nanofluid flow. The gravitational effects are taken into account and the three-dimensional governing equations of mixed convection in curved porous media, under magnetohydrodynamic effects, are reduced to those solvable by a finite difference scheme. Through varying a mixed convection parameter, the situations dominated by forced, mixed and free convection are examined systematically. The numerical solutions of these equations reveal the flow velocity and temperature fields as well as the Nusselt number and induced shear stress. These are then used to calculate the rate of entropy generation within the system by viscous and heat transfer irreversibilities. The results show that Nusselt number increases with increasing the concentration of nanoparticles, while it slightly deceases through intensifying the magnetic parameter. Non-uniform transpiration is shown to strongly affect the average rate of heat transfer. Importantly, it is demonstrated that the specific mode of heat convection can majorly influence the intensity of entropy generation and that the irreversibilities are much larger under natural convection compared to those in mixed and forced convection. Calculation of Bejan number shows that this is due to more pronounced relative contribution of viscous irreversibilities when free convection effects dominate the mixed convection process.

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“…Wong and Saeid (2009a, b) considered a jet flow blowing on the surface of a horizontal porous medium heated from below and investigated the heat transfer by mixed convection. By assuming local thermal equilibrium (Wong and Saeid 2009a) and local thermal non-equilibrium (Wong and Saeid 2009b) they conducted numerical parametric studies to optimise the Nusselt number.…”

Section: Introductionmentioning

confidence: 99%

On the Hydrodynamics and Heat Convection of an Impinging External Flow Upon a Cylinder with Transpiration and Embedded in a Porous Medium

et al. 2017

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This paper extends the existing studies of heat convection by an external flow impinging upon a flat porous insert to that on a circular cylinder inside a porous medium. The surface of the cylinder is subject to constant temperature and can include uniform or non-uniform transpiration. These cylindrical configurations are introduced in the analyses of stagnation-point flows in porous media for the first time. The equations governing steady transport of momentum and thermal energy in porous media are reduced to simpler nonlinear differential equations and subsequently solved numerically. This reveals the dimensionless velocity and temperature fields of the stagnation-point flow, as well as the Nusselt number and shear stress on the surface of the cylinder. The results show that transpiration on the surface of the cylinder and Reynolds number of the external flow dominate the fluid dynamics and heat transfer problems. In particular, non-uniform transpiration is shown to significantly affect the thermal and hydrodynamic responses of the system in the circumferential direction. However, the permeability and porosity of the porous medium are found to have relatively smaller influences.

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Numerical study of mixed convection on jet impingement cooling in a horizontal porous layer-using Brinkman-extended Darcy model

Cited by 31 publications

References 23 publications

Numerical study of mixed convection on jet impingement cooling in an open cavity filled with porous medium

Numerical study of mixed convection on jet impingement cooling in an open cavity filled with porous medium

Mixed convection and thermodynamic irreversibilities in MHD nanofluid stagnation-point flows over a cylinder embedded in porous media

On the Hydrodynamics and Heat Convection of an Impinging External Flow Upon a Cylinder with Transpiration and Embedded in a Porous Medium

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